I power an amplifier using ADD-55 power source with "built in UPS functionality". As supposed, it charges a battery connected to "battery" output, and continues to run on it when mains power fails.

What I don't understand is why power source doesn't start on that battery. I.e. I have a spare charged battery "in the field", no mains power, and I want to switch on the amplifier. Unexpectedly, the only way to start without mains power is to connect a battery to +V output of power source (not "battery" output).

What is proper way to arrange such a cold start?

Addition: power source is ADD-55A, load is custom built RF amplifier, battery is lead-acid 12V 3A*h, circuit is trivial:

add-55a battery backup

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    \$\begingroup\$ Please explain in detail or draw a diagram how exactly you have connected the batteries and loads to the power supply. Also add what is the exact power supply model (ADD-55 is not exact enough), what is the load, and what kind of battery you are using. \$\endgroup\$ – Justme Apr 4 at 14:33
  • \$\begingroup\$ Ask Meanwell if what you're trying to do is supported. After a quick skim of the datasheet I don't see anything indicating that it should work, but they could confirm. \$\endgroup\$ – user1850479 Apr 4 at 15:07
  • \$\begingroup\$ How much current your amplifier takes? \$\endgroup\$ – Justme Apr 4 at 15:46
  • \$\begingroup\$ I would like to know general answer (kind a review) about cold start of such sources, to use them in another, different projects too. \$\endgroup\$ – sa7 Apr 4 at 15:53

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